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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #1  
Old 4th August 2021
Jaime1840 Jaime1840 is offline
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Default Timing marks PICTURES

Hey guys, I just wanted to double check with you that the timing marks are okay, I know that the breather valve dot is slightly off but I can't get it perfectly centered on the notch. Thanks in advance.

https://postimg.cc/qNkjD9HT
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Old 4th August 2021
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The pinion gear mark along with the #2 cam should be set first so that they are in perfect alignment. Then install the #1 cam to mate with the #2, Then do the #3 and #4.

It is important to do the pinion and #2 first. It is common to do the #1 first simply because it is #1. Nope!
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Jaime1840 Jaime1840 is offline
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Quote:
Originally Posted by IronMick View Post
The pinion gear mark along with the #2 cam should be set first so that they are in perfect alignment. Then install the #1 cam to mate with the #2, Then do the #3 and #4.

It is important to do the pinion and #2 first. It is common to do the #1 first simply because it is #1. Nope!
Okay, but does it look OK in the picture I posted? I don't know how you were able to put #2 first and then #1. I had to put #1 and #3 and then align them with the #2 and also with the pinion gear...
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Old 4th August 2021
kitabel kitabel is offline
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100 people make this mistake every year on every 45, K, Sportster and UL for the last 50 years that I can remember.
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Jaime1840 Jaime1840 is offline
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Originally Posted by kitabel View Post
It's wrong.
There are two different mark alignments in the cam chest, and they NEVER coincide.
1. Pinion gear + #2 cam (and all remaining cams).
2. Flywheel full advance timing mark in the window + breather dot in the pump slot.
Neither of these occur at TDC.
I don't know what you mean... I followed all the steps in the fsm and It looks exactly like in the picture in the fsm
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Old 4th August 2021
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Quote:
Originally Posted by Jaime1840 View Post
Okay, but does it look OK in the picture I posted? I don't know how you were able to put #2 first and then #1. I had to put #1 and #3 and then align them with the #2 and also with the pinion gear...
IMO it does not look close enough, but I could be wrong.

The procedure to re-install the cams may be a bit tedious, but it is simple and easy to do ...

Do not use the ignition timing hole mark. Proceed as follows ...
  1. Position the pinion gear mark at approximately the 11:00 position by rotating the engine using either the rear wheel or the kicker
  2. Install cam #2 so that the mark lines up with the pinion gear mark. This may require moving the pinion gear mark a bit so they match perfectly
  3. Temporarily, partially uninstall #2 while you install #1
  4. Install #3, then #4 and finally the generator idler gear

When checking for the marks matching get down low and look straight on. Looking down at an angle may result in marks appearing to be correctly aligned when they are not.

The idea that installing cam gears is difficult or risky or to be feared even is an internet myth. It may be based on installing cam gear #1 first simply because it is #1. It is important to start with #2 so that it and the pinion gear can be lined up before installing any other cam gears.
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I took a better picture, maybe you guys can see the marks better on this one. I really don't think I can line up the marks better than they already are.

https://postimg.cc/t7HtbScD
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When I look at the pic, and imagine what happens to each pair if I rotate the pinion a bit counter clockwise, I imagine 2-3 and 3-4 lining up better. #1 might be better too. I would uninstall and re-install according to my procedure. Step 3 is a bit tedious.
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Jaime1840 Jaime1840 is offline
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Quote:
Originally Posted by IronMick View Post
When I look at the pic, and imagine what happens to each pair if I rotate the pinion a bit counter clockwise, I imagine 2-3 and 3-4 lining up better. #1 might be better too. I would uninstall and re-install according to my procedure. Step 3 is a bit tedious.
Okay thanks Mick!
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This is the result following your procedure Mick, I think I did it right this time:

https://postimg.cc/0b7LG3rM
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